Deep analysis of PCB boards and integrated circuit areas
The current PCB circuit board is mainly composed of the following:
Pattern and Pattern: The line is used as a tool for conducting conduction between the originals. In the design, a large copper surface is additionally designed as the grounding and power supply layer. The line and the drawing are made at the same time.
Dielectric: used to maintain the insulation between the circuit and the layers, commonly known as the substrate.
Through hole / via: The via hole can make the two levels above the line conduct each other, the larger via hole is used as the component insert, and the non-via hole (nPTH) is usually used as the surface mount. Positioning and fixing screws for assembly.
Solder resistant /Solder Mask: Not all copper surfaces should be tinned. Therefore, non-tin-stained areas will be printed with a layer of copper-free material (usually epoxy) to avoid Short circuit between lines that are not tinned. According to different processes, it is divided into green oil, red oil and blue oil.
Legend /Marking/Silk screen:
This is a non-essential structure. The main function is to mark the name and position frame of each part on the circuit board to facilitate post-assembly maintenance and identification.
Surface Finish: Since the copper surface is easily oxidized in a general environment, it is impossible to apply tin (poor solderability), so it is protected on the copper surface where tin is to be eaten. The protection methods include spray coating (HASL), gold (ENIG), silver (Immersion Silver), tin (Immersion TIn), and organic solder resist (OSP). The methods have their own advantages and disadvantages, collectively referred to as surface treatment.
PCB board features:
Can be high density：
For decades, the high density of printed boards has grown with the increased integration of integrated circuits and advances in mounting technology.
Through a series of inspections, tests and aging tests, the PCB can be reliably operated for a long period of time (usually 20 years).
For the various performances of PCB (electrical, physical, chemical, mechanical, etc.), the design of printed boards can be realized through design standardization and standardization, with short time and high efficiency.
With modern management, it can carry out standardization, scale (quantity), automation and other production to ensure product quality consistency.
Established relatively complete test methods, test standards, various test equipment and instruments to detect and identify PCB product qualification and service life.
PCB products not only facilitate the standardized assembly of various components, but also can be automated, large-scale mass production. At the same time, the PCB and various component assembly components can be assembled to form larger components and systems up to the complete machine.
Since PCB products and various component assembly components are produced in a standardized design and scale, these components are also standardized. Therefore, once the system fails, it can be replaced quickly, conveniently and flexibly, and the system can be quickly restored. Of course, you can say more about it. Such as miniaturization and weight reduction of the system, high-speed signal transmission, and the like.
Integrated circuit features:
The integrated circuit has the advantages of small size, light weight, less lead wires and solder joints, long life, high reliability, good performance, etc., and low cost, and is convenient for mass production. It is widely used not only in industrial and civil electronic equipment such as tape recorders, televisions, computers, etc., but also in military, communication, remote control and other aspects. The use of integrated circuits to assemble electronic devices has an assembly density that can be increased by several tens to several thousand times compared to transistors, and the stable operating time of the device can be greatly improved.
The difference between PCB and integrated circuit：
An integrated circuit generally refers to the integration of a chip, such as a north bridge chip on a motherboard. Inside the CPU, it is called an integrated circuit, and the original name is also called an integrated block. The printed circuit refers to the circuit board we usually see, and the solder chip is printed on the circuit board.
The integrated circuit (IC) is soldered on the PCB; the PCB version is the carrier of the integrated circuit (IC). The PCB board is a printed circuit board (PCB). Printed circuit boards appear in almost every electronic device. If there are electronic parts in a certain device, the printed circuit boards are mounted on different sizes of PCB. In addition to fixing various small parts, the main function of the printed circuit board is to make the electrical connection between the parts above.